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Accueil du site → Master → Pays Bas → 2014 → Modelling co-treatment of faecal sludge in a biological wastewater treatment system with an Imhoff tank, Adama, Ethiopia

UNESCO-IHE Institute for Water Education, Delft (2014)

Modelling co-treatment of faecal sludge in a biological wastewater treatment system with an Imhoff tank, Adama, Ethiopia

Hagos, Y.G.

Titre : Modelling co-treatment of faecal sludge in a biological wastewater treatment system with an Imhoff tank, Adama, Ethiopia

Auteur : Hagos, Y.G.

Université de soutenance : UNESCO-IHE Institute for Water Education, Delft

Grade : Master of Science (MS) 2014

Résumé partiel
Like other cities in Africa, in Adama town, Ethiopia, septic tanks and pit latrines are the most common onsite sanitation systems. Only 30% of the faecal sludge from these on-site sanitation systems are collected and dumped into a stabilization pond located 9.2 km west of the city. The rest is dumped uncontrolled imposing problems on the environment and public health. The poor design and construction of the stabilization pond results in odor problems in the surroundings and there are often complains by the communities residing nearby. In addition ; the effluent from the pond joins the river course downstream and the communities downstream use this polluted water for different purposes such as washing and agricultural activities. This high pressure imposed leads to the Municipality to look for other options. The Ministry of Education (MoE) of Ethiopia is currently building 15 wastewater treatment plants (WWTP) in 13 universities across the country on which one of them is the Adama Science and Technology University(ASTU) WWTP, Adama, Ethiopia. This WWTP is designed based on conservative assumptions which might result in the over design capacity of the plant. Hence, this excess capacity may accommodate faecal sludge collected from Adama town and co-treated with the ASTU wastewater in the ASTU WWTP. Therefore, this study aims to assess the feasibility of the co-treatment of faecal sludge from pit latrines and septic tanks from Adama town with the ASTU wastewater in the ASTU WWTP.In order to verify the design data used for the design of the ASTU WWTP, first a detailed chemical analysis was conducted followed by a detailed COD and TN fractionation of the wastewater from the university and the faecal sludge from pit latrines and septic sludge. Then, the possibility of the co-treatmentof the faecal sludge with ASTU wastewater in the ASTU WWTP was assessed using the Bio-Win process simulation 3.1 model as a tool. A detailed characterization using standard methods (APHA 1995) of the ASTU WW and FS from pit latrines and septic tanks was conducted in ASTU chemistry laborator

Sujets  : faecal sludge biological wastewater treatment systems pit latrines septic tanks Ethiopia

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